CVE-2026-25592
Semantic Kernel has an Arbitrary File Write via AI Agent Function Calling in .NET SDK
CVSS Score
10.0
EPSS Score
0.0%
EPSS Percentile
0th
Semantic Kernel is an SDK used to build, orchestrate, and deploy AI agents and multi-agent systems. Prior to 1.71.0, an Arbitrary File Write vulnerability has been identified in Microsoft's Semantic Kernel .NET SDK, specifically within the SessionsPythonPlugin. The problem has been fixed in Microsoft.SemanticKernel.Core version 1.71.0. As a mitigation, users can create a Function Invocation Filter which checks the arguments being passed to any calls to DownloadFileAsync or UploadFileAsync and ensures the provided localFilePath is allow listed.
| CWE | CWE-22 |
| Vendor | microsoft |
| Product | semantic-kernel |
| Ecosystems | |
| Industries | TechnologyEnterprise |
| Published | Feb 6, 2026 |
| Last Updated | Feb 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
microsoft / semantic-kernel
< 1.71.0
References
github.com: https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-2ww3-72rp-wpp4 github.com: https://github.com/microsoft/semantic-kernel/pull/13478/changes#diff-88d3cacba2bfa84eef8f2aa171b34f9940338cbb784a3ffc49f5fe3af1b8943d github.com: https://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/Demos/CodeInterpreterPlugin/Program.cs#L61-L64